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Twitchy Canvas Particles
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="2: circles canvas"> | |
| <script src="//code.jquery.com/jquery-2.1.1.min.js"></script> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <meta charset="utf-8"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <script> | |
| var width = 1000; | |
| var height = 500; | |
| var canvas = d3.select("body").append("main") | |
| .style({ width: "90%", margin: "0 auto", display: "block" }) | |
| .append("canvas") | |
| .attr({ width: width + "px", height: height }) | |
| .style({ | |
| // border: "1px solid black", | |
| width: width + "px", height: height, | |
| margin: "0 auto", display: "block" | |
| }); | |
| var context = canvas.node().getContext("2d"); | |
| var fragment = new DocumentFragment(); | |
| var mean = 1e3, deviation = mean / 10; | |
| var random = d3.random.normal(mean, deviation); | |
| function getData(n) { | |
| return d3.range(n).map(function(d, i) { | |
| return { | |
| id: i, foo: random(), bar: random(), baz: random() | |
| }; | |
| }); | |
| } | |
| var n = Math.floor(random()); | |
| var data = getData(n); | |
| var x = d3.scale.linear().range([0, width]); | |
| var y = d3.scale.linear().range([0, height]); | |
| var r = d3.scale.linear().range([1, 30]).clamp(true); | |
| var fooExtent = d3.extent(data, function(d) { return d.foo; }); | |
| var barExtent = d3.extent(data, function(d) { return d.bar; }); | |
| var bazExtent = d3.extent(data, function(d) { return d.baz; }); | |
| x.domain(fooExtent); | |
| y.domain(barExtent); | |
| r.domain(bazExtent); | |
| function update() { | |
| var people = d3.select(fragment).selectAll(".person") | |
| .data(data, function(d) { return d.id; }); | |
| people.enter().append("div").classed("person", true) | |
| .attr("data-color", "#0f0") | |
| .attr("data-foo", function(d) { return d.foo; }) | |
| .attr("data-bar", function(d) { return d.bar; }) | |
| .attr("data-baz", function(d) { return d.baz; }) | |
| // .transition().duration(300) | |
| .attr("data-color", "#000"); | |
| people.transition().duration(300) | |
| .attr("data-foo", function(d) { return d.foo; }) | |
| .attr("data-bar", function(d) { return d.bar; }) | |
| .attr("data-baz", function(d) { return d.baz; }); | |
| people.exit() | |
| // .transition().duration(300) | |
| // .attr("data-color", "#f00") | |
| .remove(); | |
| } | |
| update(); | |
| window.setInterval(function() { | |
| n = Math.floor(random()); | |
| data = getData(n); | |
| update(); | |
| }, 500); | |
| var zoom = d3.behavior.zoom() | |
| .x(x).y(y) | |
| .scale(0.54) | |
| .translate([150, 200]); | |
| canvas.call(zoom); | |
| d3.timer(draw); | |
| function draw() { | |
| context.clearRect(0, 0, width, height); | |
| context.globalAlpha = 0.05; | |
| d3.select(fragment).selectAll(".person").each(function(d) { | |
| var thiz = d3.select(this); | |
| context.beginPath(); | |
| var foo = thiz.attr("data-foo"); | |
| var bar = thiz.attr("data-bar"); | |
| var baz = thiz.attr("data-baz"); | |
| var cx = x(foo), cy = y(bar); | |
| context.moveTo(cx, cy); | |
| context.arc(cx, cy, r(baz), 0, 2 * Math.PI); | |
| context.fillStyle = thiz.attr("data-color"); | |
| context.fill(); | |
| }); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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